In Hadoop, what is the impact of the heartbeat signal between DataNode and NameNode?
- Data Block Replication
- DataNode Health Check
- Job Scheduling
- Load Balancing
The heartbeat signal between DataNode and NameNode serves as a health check for DataNodes. It allows the NameNode to verify the availability and health status of each DataNode in the cluster. If a DataNode fails to send a heartbeat within a specified time, it is considered dead or unreachable, and the NameNode initiates the block replication process to maintain data availability.
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